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Ive had my car for a few months now and have been trying to figure out this out..

Car: 2003 325xi sedan

The issue is when I start the car or just turn the key to the on position, the headlights come on(drl I assume) but the rear lights on the truck lid also light up and they are extra bright ( like rear fog lamps)

That almost sounds like the ribbon cable for your LCM face is bad. IIRC if you ground the 4th wire in from the left, the rear frogs activate. It may be the same for the headlights just a different wire.

I tried a euro lcm with rear fog button... Samething tried swapping faces Samething
If I can't get a solution from some1 here it's bye bye 3series... The sad part is I do like the car but this light issue is turning me off